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        <a href="." >Logging in via SSH</a>
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                                <h2 id="logging-in-via-ssh">Logging in via SSH</h2>
<p>Since there is one terminal with small size in the VM, it is not very convenient to use. Therefore, we recommend you to log in the VM via SSH.</p>
<h3 id="creating-a-host-only-network">Creating a Host-only Network</h3>
<p>First, you should create a host-only network for the VM. Do the followings:</p>
<ol>
<li>Shut down the VM.</li>
<li>In the VirtualBox Manager, click <code>File</code> in the menu bar, then select <code>Preferences...</code>. This will invoke a window for preference configuration.</li>
<li>Select the <code>Network</code> category on the left.</li>
<li>Click a plus button on the right of the window. This will add a host-only network named &quot;VirtualBox Host-Only Ethernet Adapter&quot;.</li>
<li>Click the button labeled with &quot;Edit host-only network&quot;. This will invoke a dialog.<ul>
<li>In the <code>Adapter</code> tab, do the following settings:<ul>
<li><strong>IPv4 Address</strong>: 192.168.56.1</li>
<li><strong>IPv4 Network Mask</strong>: 255.255.255.0</li>
</ul>
</li>
<li>In the <code>DHCP Server</code> tab, do the following settings:</li>
<li>Check <code>Enable Server</code><ul>
<li><strong>Server Address</strong>: 192.168.56.100</li>
<li><strong>Server Mask</strong>: 255.255.255.0</li>
<li><strong>Lower Address Bound</strong>: 192.168.56.101</li>
<li><strong>Upper Address Bound</strong>: 192.168.56.245</li>
</ul>
</li>
</ul>
</li>
<li>Click <code>OK</code> to go back to the VirtualBox Manager, choose the VM, then click the <code>Settings</code> button in the tool bar. This will invoke a window for VM configuration.</li>
<li>Select the <code>Network</code> category on the left.</li>
<li>Select the <code>Adapter 2</code> tab on the right.</li>
<li>Enable &quot;Adapter 2&quot;, and modify the <code>Attached to</code> attribute of Adapter 2 to <code>Host-only Adapter</code>. The <code>Name</code> attribute should become <code>VirtualBox Host-Only Ethernet Adapter</code> by default.</li>
</ol>
<p>Now launch the VM. Run</p>
<pre><code>sudo ifconfig eth1
</code></pre><p>You should see some information about the network interface &quot;eth1&quot;. If you receive an error message like</p>
<pre><code>eth1: error fetching interface information: Device not found
</code></pre><p>This is probably that you did not configure the host-only network correctly. Check yourself.</p>
<p>However, you can not see the IP address of eth1, this is because eth1 is still down. Again, you should modify the configuration file. Append the following lines at the end of the file <code>/etc/network/interfaces</code>:</p>
<pre><code>auto eth1
iface eth1 inet dhcp
</code></pre><p>After modifying the &quot;interfaces&quot; file, restart the network:</p>
<pre><code>sudo /etc/init.d/networking restart
</code></pre><p>Run</p>
<pre><code>sudo ifconfig eth1
</code></pre><p>again. You should see the IP address of eth1, such as 192.168.56.xxx. Remember this IP address, and you will use it later.</p>
<h3 id="host-configuration">Host Configuration</h3>
<p>Now keep the VM on and go back to the host. You should perform some configurations to access the VM via SSH. According to the type of your host operating system, you will perform different configuration.</p>
<h4 id="for-gnulinux-and-mac-users">For GNU/Linux and Mac users</h4>
<p>You will use the build-in <code>ssh</code> tool, and do not need to install an extra one. Open a terminal, run</p>
<pre><code>ssh username@ip_addr
</code></pre><p>where <code>username</code> is your VM user name, <code>ip_addr</code> is the IP address of eth1 mentioned above. For example:</p>
<pre><code>ssh ics@192.168.56.101
</code></pre><p>If you are prompted with </p>
<pre><code>Are you sure you want to continue connecting (yes/no)?
</code></pre><p>enter &quot;yes&quot;. Then enter your VM user password. If everything is fine, you will access the VM via SSH successfully. To exit SSH, just type</p>
<pre><code>exit
</code></pre><p>in terminal.</p>
<h4 id="for-windows-users">For Windows users</h4>
<p>Windows has no build-in <code>ssh</code> tool, and you have to download one manually. Download the <strong>latest release version</strong> of <code>putty.exe</code> <a href="http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html" target="_blank">here</a>. Run <code>putty.exe</code>, and you will see a dialog is invoked. In the input box labeled with <code>Host Name (or IP address)</code>, enter the IP address of eth1 mentioned above. Leave other settings default, then click <code>Open</code> button. Enter your VM user name and password. If everything is fine, you will access the VM via SSH successfully. To exit SSH, just type</p>
<pre><code>exit
</code></pre><p>in terminal.</p>
<h3 id="installing-tmux">Installing tmux</h3>
<p><code>tmux</code> is a terminal multiplexer. With it, you can create multiple terminals in a single screen. It is very convenient when you are working with a high resolution monitor (that is why we recommend you to log in via SSH). To install <code>tmux</code>, just issue the following command:</p>
<pre><code>apt-get install tmux
</code></pre><p>Now you can run <code>tmux</code>, but let&apos;s do some configuration first. Go back to the home directory:</p>
<pre><code>cd ~
</code></pre><p>New a file called <code>.tmux.conf</code>:</p>
<pre><code>vim .tmux.conf
</code></pre><p>Append the following content to the file:</p>
<pre><code>setw -g c0-change-trigger 100
setw -g c0-change-interval 250

bind-key c new-window -c &quot;#{pane_current_path}&quot;
bind-key % split-window -h -c &quot;#{pane_current_path}&quot;
bind-key &apos;&quot;&apos; split-window -c &quot;#{pane_current_path}&quot;
</code></pre><p>The first two lines of settings control the output rate of <code>tmux</code>. Without them, <code>tmux</code> may become unresponsive when lots of contents are output to the screen. The last three lines of settings make <code>tmux</code> &quot;remember&quot; the current working directory of the current pane while creating new window/pane.</p>
<p>If you use <code>ls</code> to list files, you will not see the <code>.tmux.conf</code> you just created. This is because a file whose name starts with a <code>.</code> is a hidden file in GNU/Linux. To show hidden files, use <code>ls</code> with <code>-a</code> option:</p>
<pre><code>ls -a
</code></pre><p>You can scroll the content in a <code>tmux</code> terminal up and down. Also, using <code>tmux</code> with SSH, you can create multiple normal-size terminals within single screen. For how to use <code>tmux</code>, please search the Internet. The following picture shows a scene working with multiple terminals within single screen. Is it COOL?</p>
<p><img src="images/Tmux1.png" alt="tmux"></p>
<p><div class="panel"><div class="box">Things behind scrolling</div><div class="word-in-panel"><p>You should have used scroll bars in GUI. You may take this for granted. So you may consider the original un-scrollable terminal in the VM (the one you use when you just log in) the hell. But think of these: why the original terminal can not be scrolled? How does <code>tmux</code> make the terminals scrollable? And last, do you know how to implement a scroll bar?</p>
<p>GUI is not something mysterious. Remember, behind every elements in GUI, there is a story about it. Learn the story, and you will learn a lot. You may say &quot;I just use GUI, and it is unnecessary to learn the story.&quot; Yes, you are right. The appearance of GUI is to hide the story for users. But almost everyone uses GUI in the world, and that is why you can not tell the difference between you and them.</p>
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